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Which of the following statements about hydrogen is incorrect?

1. hydrogen has three isotopes of which tritium is the most common.
2. Hydrogen never acts as cation in ionic salts.
3. Hydronium ion, H3O+ exists freely in solution.
4. Dihydrogen does not act as a reducing agent.

Correct answer: hydrogen has three isotopes of which tritium is the most common.

Solution

The incorrect statement is A because tritium is the least common isotope of hydrogen, not the most common. Protium is the most abundant isotope of hydrogen.

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